7/7/2013 3:34 PM  
Joined: 2/12/2013 Last visit: 12/6/2023 Posts: 61 Rating: (15) 
hi everybody, i want to know how can we calculate ampere rating from capacitor(kvar) value? give proper formulae if possible.... 
7/7/2013 3:47 PM  
Posts: 8946 Rating: (998) 
I = P / U P = U * I R = U / I 
7/7/2013 4:07 PM  
Joined: 5/28/2008 Last visit: 12/9/2023 Posts: 4486 Rating: (834) 
Q [ kVAR] = V [Volt] * I [Amp.] *Sin (phi) While (Phi) is the angle between V & I If you know Q, V, and PF (Cos Phi), then you can get Cirrent. Hope this helps.

Ayman Elotaify 

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7/7/2013 4:12 PM  
Joined: 7/8/2009 Last visit: 7/26/2023 Posts: 1974 Rating: (475) 
Hope this will help KW = √3 *V*I*COS ɸ KVA = √3 *V*I KVAR=√3 *V*I*SIN ɸ = KVA*√(1COS ɸ*COS ɸ) Regards,Devesh Vithani 
I dont Like people driving Fast, thats the reason I overtake them ;) 

7/7/2013 4:18 PM  
Joined: 11/21/2007 Last visit: 10/3/2023 Posts: 2321 Rating: (305) 
For a pure Capacitive load the Sin(phi) = 1. However in real capacitors the Sin(Phi) whould be close to 1
Therefore for a pure capacitor : Q [ kVAR] * 1000 = V [Volt] * I [Amp.] * 1 I [Amp] = ( Q [ kVAR] * 1000 ) / V [Volt] Hope this helps Cheers Navnag 
There is no such thing as the last bug in a program 

7/7/2013 5:01 PM  
Joined: 5/28/2008 Last visit: 12/9/2023 Posts: 4486 Rating: (834) 
Dear all, From the given data, all the above solution may be correct. Coz every body including myself put his assumption. kinjalpatel1899did not told us if it is 3 phase circuit or not. SoVithani'sAnswer is correct if it is 3 phase circut and ifkinjalpatel1899have some other loads connected with the capacitor bank. I mean if it is not a pure capacitor bank load. And in this case you need to know power factor. Navnaganswer is also correct if it is a pure capacitor bank. In this case Sin Phi = 1. So, I think thatkinjalpatel1899have to clarify these points or go through thislink 
Ayman Elotaify 

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7/7/2013 5:04 PM  
Joined: 3/21/2006 Last visit: 12/4/2023 Posts: 10222 Rating: (1178) 
OFT I had this conversion inbuilt in my mobile. Never thought about how is exactly the calculations done. It is clear now.

7/7/2013 5:14 PM  
Joined: 4/23/2010 Last visit: 12/9/2023 Posts: 8071 Rating: (861) 
KVAR *1000 Current I =  Sq root of 3 * voltage 
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